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Marvell manufactures a variety of electronics products, including both wired and wireless routers. Although many Marvell router users have no problems connecting their devices to their router via the LAN port, you may find that your router's LAN port isn't working. Several problems can cause a LAN port to malfunction, ranging from issues with the port itself to router firmware problems. By troubleshooting through each possible problem, you can usually get your Marvell LAN port working again. Temporary Failure · Your Marvell router's LAN port not working may be only a temporary problem. This commonly occurs because the router has overheated or has recently lost power. To resolve a temporary LAN port failure problem, unplug the router for 20 to 30 seconds and then plug it back in. If this doesn't work, you may need to perform a router reset by holding down the reset button for 20 to 30 seconds. Your LAN port should work. Firmware Issues · Firmware is the built-in software, found on devices like the Marvell router, responsible for controlling the router's key functions, including the LAN ports. If your router's firmware has become corrupt, this can cause the LAN port to stop functioning correctly. You can typically fix LAN port issues caused by firmware problems by installing a fresh copy of the firmware for your Marvell router. Visit the support page for your Marvell router to learn how to download and install firmware for the router. Defective Port · If your Marvell LAN port fails to work after installing the firmware and turning off or rebooting the router, the LAN port itself may be bad. This typically occurs when the router is dropped or otherwise damaged. The port may also be defective due to a manufacturing error. You can usually resolve this issue by contacting Marvell to have your router's LAN port repaired or replaced. Bad Cable · When connecting a device to your Marvell's LAN port, you must use an Ethernet cable. If the cable is damaged in any way, the LAN port appears as if it's not working. Signs of cable damage include exposed or bent parts of the wire, although some cables may appear to be fine even though they aren't fully functional. If your cable is to blame for your LAN port issue, you can fix the problem by repairing or replacing it. Cables can be purchased at any electronics store or online.